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WJ-8718-19/FE HF RECEIVER
MAINTENANCE
2.
Interior - Dust in the interior of the unit should be removed
before it builds up enough to cause arcing and short circuits
during periods of high humidity.
Dust is best removed by dry,
low-pressure air.
Dirt clinging to surfaces may be removed
with a soft-bristled paint brush or a clean, lint-free cloth
dampened with a mild detergent and water solution.
Use a
cotton-tipped applicator for cleaning in narrow spaces and on
the circuit boards.
3.
Switch Contacts
-
When
maintenance is necessary due to
accumulated
dirt
and
dust
on
the contacts,
observe the
following precautions: Clean the switch contacts with isopropyl
alcohol or a mild detergent solution.
Avoid cleaning solutions
containing benzene, acetone, or similar solvents.
4.2.3
LUBRICATION
The optical encoder assembly shaft requires lubrication every 720 hours of
operation to prevent excessive wear.
The other rotating assemblies in the receiver
are sealed and do not require lubrication.
To lubricate the encoder assembly shaft,
perform the following steps:
CAUTION
Excessive lubrication of the encoder shaft
may destroy the optical characteristics of
the en coder wheel.
1.
Place the receiver in a vertical position and remove the
encoder knob.
2.
Apply one (1) drop of SAE 5W-20W oil to the encoder
shaft at the retaining ring.
3.
Reassemble the encoder assembly
knob and rotate the
knob several times to distribute the lubricant.
4.3
RECEIVER CHECKOUT PROCEDURE
4.3.1
GENERAL
The checkout procedure outlined in this paragraph defines the minimum
performance standards which ensure adequate receiver functioning all detection modes,
gain modes and IF
bandwidths.
The tests should be used for initial receiver
inspection, for preventive maintenance checks,
for troubleshooting or to verify
receiver performance after repairs have been made.
4-3
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